src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java

@@ -85,7 +85,8 @@
    }

    @Override
    public Response authenticated(UserSessionModel userSession, AuthenticatedClientSessionModel clientSession) {
    public Response authenticated(UserSessionModel userSession, ClientSessionContext clientSessionCtx) {
        AuthenticatedClientSessionModel clientSession = clientSessionCtx.getClientSession();
        ClientSessionCode<AuthenticatedClientSessionModel> accessCode = new ClientSessionCode<>(session, realm, clientSession);

        String service = clientSession.getRedirectUri();